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Formication is the sensation resembling that of small insects crawling on (or under) the skin, in the absence of actual insects. It is one specific form of a set of sensations known as paresthesias, which also include the more common prickling, tingling sensation known as pins and needles. Formication is a well-documented symptom which has ...
Erythroderma is an inflammatory skin disease with redness and scaling that affects nearly the entire cutaneous surface. [ 1 ] [ 2 ] This term applies when 90% or more of the skin is affected. In ICD-10 , a distinction is made between "exfoliative dermatitis" at L26, and "erythroderma" at L53.9.
The exact mechanism of the condition is unknown. Some studies have suggested the itching occurs in response to increased fibrinolytic activity in the skin, [5] [6] inappropriate activation of the sympathetic nervous system, [7] increased activity of acetylcholinesterase, [8] [9] or an increase in mast cell degranulation that releases histamine and other chemicals into the body.
Paresthesia, also known as pins and needles, is an abnormal sensation of the skin (tingling, pricking, chilling, burning, numbness) with no apparent physical cause. [1] Paresthesia may be transient or chronic, and may have many possible underlying causes. [ 1 ]
Pain can also be present. Dermatitis can occur anywhere on the skin, but is most common on the hands (22% of people), scattered across the body (18%), or on the face (17%). [5] The rash and other symptoms typically occur 24 to 48 hours after the exposure; in some cases, the rash may persist for weeks. [2]
Cutaneous dysesthesia is characterized by discomfort or pain from touch to the skin by normal stimuli, including clothing. The unpleasantness can range from a mild tingling to blunt, incapacitating pain. [citation needed] Scalp dysesthesia is characterized by pain or burning sensations on or under the surface of the cranial skin. Scalp ...
Localized or generalized pruritus without a primary skin lesion; Chronic pruritus, characterized as being greater than 6 weeks; There is no somatic cause present; 7 Optional criteria (need 3 to diagnose) A chronological relationship of pruritus with one or several life events that can have psychological consequences; Changes during the nighttime
Oxcarbazepine was reported to reduce the severity of symptoms in a few cases. [10] One patient has been treated with "paravertebral nerve blocks, with bupivacaine and methylprednisolone acetate injected into the T3–T4 and T5–T6 intervertebral spaces" [ 11 ] Hydroxyzine has also been used with considerable success in some cases as long as ...